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add another solar battery charger option

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Sebastian Kuzminsky 2025-08-29 23:14:49 -06:00
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hardware/power.md
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@ -14,7 +14,13 @@ Strawman design proposal: 1S LiPo, 18650 for easy ubiquitous availability
* have on hand (i think)
3. [Adjustable](https://www.amazon.com/Lithium-Battery-Charger-Charging-Converter/dp/B089NG9TFW)
* combine with [heatsink](https://www.amazon.com/Printer-Heatsink-Thermal-Conductive-Adhesive/dp/B07RKHRHJV)
4. [Adafruit 6091](https://www.adafruit.com/product/6091)
* $7
* 5-18V input, USB-C or PV/DC
* CC at 1.0 A, 0.5 A, or 0.25 A
* handles LiPo/LiIon or LiFePo cells
* optional thermistor to reduce charge current when battery overheats
* [schematic](https://learn.adafruit.com/adafruit-bq25185-usb-dc-solar-lithium-ion-polymer-charger/downloads#schematic-and-fab-print-3188140)
strawman: charging up to 4v with the INR18650 (see `CELLS:INR18650-35E` for the discharge capacity graph, and `CHARGERS:3` for 4V cutoff w/ a 5V panel) gives us ~3000mAh, or 88% of the 3398mAh tested battery life.